Sonar Operation; Chirp - Lowrance Mark-4 Operation Manual

Sonar Operation

This unit supports two types of sonar: Conventional
and Downscan.
The features described in this section are for
conventional sonar. Refer to the Downscan section
for information on Downscan features.

CHIRP

A CHIRP (Compressed High Intensity Radar
Pulse) transducer transmits a modulated pulse of
multiple frequencies within the bandwidth of the
Sonar Operation | Elite series
selected transducer type. This results in better
image quality, better target separation and greater
depth penetration.
This unit supports High CHIRP, Medium CHIRP and
Low CHIRP, depending on the transducer.
CHIRP can be used with Lowrance conventional
sonar transducers.
• 50/200 kHz (Low/High CHIRP)
• 83/200 kHz (Medium/High CHIRP)
To use CHIRP, select the desired CHIRP frequency
from the Frequency menu.
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